contrib/ntp/ntpdate/ntptime_config.c

   1 /*
   2  * ntptime_config.c
   3  *
   4  * What follows is a simplified version of the config parsing code
   5  * in ntpd/ntp_config.c.  We only parse a subset of the configuration
   6  * syntax, and don't bother whining about things we don't understand.
   7  *
   8  */
   9
  10 #ifdef HAVE_CONFIG_H
  11 # include <config.h>
  12 #endif
  13
  14 #include "ntp_fp.h"
  15 #include "ntp.h"
  16 #include "ntp_io.h"
  17 #include "ntp_unixtime.h"
  18 #include "ntp_filegen.h"
  19 #include "ntpdate.h"
  20 #include "ntp_syslog.h"
  21 #include "ntp_stdlib.h"
  22
  23 #include <stdio.h>
  24 #include <signal.h>
  25 #include <ctype.h>
  26
  27 /*
  28  * These routines are used to read the configuration file at
  29  * startup time.  An entry in the file must fit on a single line.
  30  * Entries are processed as multiple tokens separated by white space
  31  * Lines are considered terminated when a '#' is encountered.  Blank
  32  * lines are ignored.
  33  */
  34
  35 /*
  36  * Configuration file name
  37  */
  38 #ifndef CONFIG_FILE
  39 # ifndef SYS_WINNT
  40 #  define       CONFIG_FILE "/etc/ntp.conf"
  41 # else /* SYS_WINNT */
  42 #  define       CONFIG_FILE     "%windir%\\ntp.conf"
  43 #  define       ALT_CONFIG_FILE "%windir%\\ntp.ini"
  44 # endif /* SYS_WINNT */
  45 #endif /* not CONFIG_FILE */
  46
  47 /*
  48  *
  49  * We understand the following configuration entries and defaults.
  50  *
  51  * peer [ addr ] [ version 3 ] [ key 0 ] [ minpoll 6 ] [ maxpoll 10 ]
  52  * server [ addr ] [ version 3 ] [ key 0 ] [ minpoll 6 ] [ maxpoll 10 ]
  53  * keys file_name
  54  */
  55
  56 #define CONFIG_UNKNOWN          0
  57
  58 #define CONFIG_PEER             1
  59 #define CONFIG_SERVER           2
  60 #define CONFIG_KEYS             8
  61
  62 #define CONF_MOD_VERSION        1
  63 #define CONF_MOD_KEY            2
  64 #define CONF_MOD_MINPOLL        3
  65 #define CONF_MOD_MAXPOLL        4
  66 #define CONF_MOD_PREFER         5
  67 #define CONF_MOD_BURST          6
  68 #define CONF_MOD_SKEY           7
  69 #define CONF_MOD_TTL            8
  70 #define CONF_MOD_MODE           9
  71
  72 /*
  73  * Translation table - keywords to function index
  74  */
  75 struct keyword {
  76         const char *text;
  77         int keytype;
  78 };
  79
  80 /*
  81  * Command keywords
  82  */
  83 static  struct keyword keywords[] = {
  84         { "peer",       CONFIG_PEER },
  85         { "server",     CONFIG_SERVER },
  86         { "keys",       CONFIG_KEYS },
  87         { "",           CONFIG_UNKNOWN }
  88 };
  89
  90 /*
  91  * "peer", "server", "broadcast" modifier keywords
  92  */
  93 static  struct keyword mod_keywords[] = {
  94         { "version",    CONF_MOD_VERSION },
  95         { "key",    CONF_MOD_KEY },
  96         { "minpoll",    CONF_MOD_MINPOLL },
  97         { "maxpoll",    CONF_MOD_MAXPOLL },
  98         { "prefer", CONF_MOD_PREFER },
  99         { "burst",  CONF_MOD_BURST },
 100         { "autokey",    CONF_MOD_SKEY },
 101         { "mode",   CONF_MOD_MODE },    /* reference clocks */
 102         { "ttl",    CONF_MOD_TTL },     /* NTP peers */
 103         { "",       CONFIG_UNKNOWN }
 104 };
 105
 106 /*
 107  * Limits on things
 108  */
 109 #define MAXTOKENS       20      /* 20 tokens on line */
 110 #define MAXLINE         1024    /* maximum length of line */
 111 #define MAXFILENAME 128 /* maximum length of a file name (alloca()?) */
 112
 113 /*
 114  * Miscellaneous macros
 115  */
 116 #define STRSAME(s1, s2)         (*(s1) == *(s2) && strcmp((s1), (s2)) == 0)
 117 #define ISEOL(c)                ((c) == '#' || (c) == '\n' || (c) == '\0')
 118 #define ISSPACE(c)              ((c) == ' ' || (c) == '\t')
 119 #define STREQ(a, b)     (*(a) == *(b) && strcmp((a), (b)) == 0)
 120
 121 /*
 122  * Systemwide parameters and flags
 123  */
 124 extern struct server **sys_servers;     /* the server list */
 125 extern int sys_numservers;      /* number of servers to poll */
 126 extern char *key_file;
 127
 128 /*
 129  * Function prototypes
 130  */
 131 static  int gettokens   P((FILE *, char *, char **, int *));
 132 static  int matchkey    P((char *, struct keyword *));
 133 static  int getnetnum   P((const char *num, struct sockaddr_in *addr,
 134                            int complain));
 135
 136
 137 /*
 138  * loadservers - load list of NTP servers from configuration file
 139  */
 140 void
 141 loadservers(
 142         char *cfgpath
 143         )
 144 {
 145         register int i;
 146         int errflg;
 147         int peerversion;
 148         int minpoll;
 149         int maxpoll;
 150         /* int ttl; */
 151         int srvcnt;
 152         /* u_long peerkey; */
 153         int peerflags;
 154         struct sockaddr_in peeraddr;
 155         FILE *fp;
 156         char line[MAXLINE];
 157         char *(tokens[MAXTOKENS]);
 158         int ntokens;
 159         int tok;
 160         const char *config_file;
 161 #ifdef SYS_WINNT
 162         char *alt_config_file;
 163         LPTSTR temp;
 164         char config_file_storage[MAX_PATH];
 165         char alt_config_file_storage[MAX_PATH];
 166 #endif /* SYS_WINNT */
 167         struct server *server, *srvlist;
 168
 169         /*
 170          * Initialize, initialize
 171          */
 172         srvcnt = 0;
 173         srvlist = 0;
 174         errflg = 0;
 175 #ifdef DEBUG
 176         debug = 0;
 177 #endif  /* DEBUG */
 178 #ifndef SYS_WINNT
 179         config_file = cfgpath ? cfgpath : CONFIG_FILE;
 180 #else
 181         if (cfgpath) {
 182                 config_file = cfgpath;
 183         } else {
 184                 temp = CONFIG_FILE;
 185                 if (!ExpandEnvironmentStrings((LPCTSTR)temp, (LPTSTR)config_file_storage, (DWORD)sizeof(config_file_storage))) {
 186                         msyslog(LOG_ERR, "ExpandEnvironmentStrings CONFIG_FILE failed: %m\n");
 187                         exit(1);
 188                 }
 189                 config_file = config_file_storage;
 190         }
 191
 192         temp = ALT_CONFIG_FILE;
 193         if (!ExpandEnvironmentStrings((LPCTSTR)temp, (LPTSTR)alt_config_file_storage, (DWORD)sizeof(alt_config_file_storage))) {
 194                 msyslog(LOG_ERR, "ExpandEnvironmentStrings ALT_CONFIG_FILE failed: %m\n");
 195                 exit(1);
 196         }
 197         alt_config_file = alt_config_file_storage;
 198 M
 199 #endif /* SYS_WINNT */
 200
 201         if ((fp = fopen(FindConfig(config_file), "r")) == NULL)
 202         {
 203                 fprintf(stderr, "getconfig: Couldn't open <%s>\n", FindConfig(config_file));
 204                 msyslog(LOG_INFO, "getconfig: Couldn't open <%s>", FindConfig(config_file));
 205 #ifdef SYS_WINNT
 206                 /* Under WinNT try alternate_config_file name, first NTP.CONF, then NTP.INI */
 207
 208                 if ((fp = fopen(FindConfig(alt_config_file), "r")) == NULL) {
 209
 210                         /*
 211                          * Broadcast clients can sometimes run without
 212                          * a configuration file.
 213                          */
 214
 215                         fprintf(stderr, "getconfig: Couldn't open <%s>\n", FindConfig(alt_config_file));
 216                         msyslog(LOG_INFO, "getconfig: Couldn't open <%s>", FindConfig(alt_config_file));
 217                         return;
 218                 }
 219 #else  /* not SYS_WINNT */
 220                 return;
 221 #endif /* not SYS_WINNT */
 222         }
 223
 224         while ((tok = gettokens(fp, line, tokens, &ntokens))
 225                != CONFIG_UNKNOWN) {
 226                 switch(tok) {
 227                     case CONFIG_PEER:
 228                     case CONFIG_SERVER:
 229
 230                         if (ntokens < 2) {
 231                                 msyslog(LOG_ERR,
 232                                         "No address for %s, line ignored",
 233                                         tokens[0]);
 234                                 break;
 235                         }
 236
 237                         if (!getnetnum(tokens[1], &peeraddr, 1)) {
 238                                 /* Resolve now, or lose! */
 239                                 break;
 240                         } else {
 241                                 errflg = 0;
 242
 243                                 /* Shouldn't be able to specify multicast */
 244                                 if (IN_CLASSD(ntohl(peeraddr.sin_addr.s_addr))
 245                                     || ISBADADR(&peeraddr)) {
 246                                         msyslog(LOG_ERR,
 247                                                 "attempt to configure invalid address %s",
 248                                                 ntoa(&peeraddr));
 249                                         break;
 250                                 }
 251                         }
 252
 253                         peerversion = NTP_VERSION;
 254                         minpoll = NTP_MINDPOLL;
 255                         maxpoll = NTP_MAXDPOLL;
 256                         /* peerkey = 0; */
 257                         peerflags = 0;
 258                         /* ttl = 0; */
 259                         for (i = 2; i < ntokens; i++)
 260                             switch (matchkey(tokens[i], mod_keywords)) {
 261                                 case CONF_MOD_VERSION:
 262                                     if (i >= ntokens-1) {
 263                                             msyslog(LOG_ERR,
 264                                                     "peer/server version requires an argument");
 265                                             errflg = 1;
 266                                             break;
 267                                     }
 268                                     peerversion = atoi(tokens[++i]);
 269                                     if ((u_char)peerversion > NTP_VERSION
 270                                         || (u_char)peerversion < NTP_OLDVERSION) {
 271                                             msyslog(LOG_ERR,
 272                                                     "inappropriate version number %s, line ignored",
 273                                                     tokens[i]);
 274                                             errflg = 1;
 275                                     }
 276                                     break;
 277
 278                                 case CONF_MOD_KEY:
 279                                     if (i >= ntokens-1) {
 280                                             msyslog(LOG_ERR,
 281                                                     "key: argument required");
 282                                             errflg = 1;
 283                                             break;
 284                                     }
 285                                     ++i;
 286                                     /* peerkey = (int)atol(tokens[i]); */
 287                                     peerflags |= FLAG_AUTHENABLE;
 288                                     break;
 289
 290                                 case CONF_MOD_MINPOLL:
 291                                     if (i >= ntokens-1) {
 292                                             msyslog(LOG_ERR,
 293                                                     "minpoll: argument required");
 294                                             errflg = 1;
 295                                             break;
 296                                     }
 297                                     minpoll = atoi(tokens[++i]);
 298                                     if (minpoll < NTP_MINPOLL)
 299                                         minpoll = NTP_MINPOLL;
 300                                     break;
 301
 302                                 case CONF_MOD_MAXPOLL:
 303                                     if (i >= ntokens-1) {
 304                                             msyslog(LOG_ERR,
 305                                                     "maxpoll: argument required"
 306                                                     );
 307                                             errflg = 1;
 308                                             break;
 309                                     }
 310                                     maxpoll = atoi(tokens[++i]);
 311                                     if (maxpoll > NTP_MAXPOLL)
 312                                         maxpoll = NTP_MAXPOLL;
 313                                     break;
 314
 315                                 case CONF_MOD_PREFER:
 316                                     peerflags |= FLAG_PREFER;
 317                                     break;
 318
 319                                 case CONF_MOD_BURST:
 320                                     peerflags |= FLAG_BURST;
 321                                     break;
 322
 323                                 case CONF_MOD_SKEY:
 324                                     peerflags |= FLAG_SKEY | FLAG_AUTHENABLE;
 325                                     break;
 326
 327                                 case CONF_MOD_TTL:
 328                                     if (i >= ntokens-1) {
 329                                             msyslog(LOG_ERR,
 330                                                     "ttl: argument required");
 331                                             errflg = 1;
 332                                             break;
 333                                     }
 334                                     ++i;
 335                                     /* ttl = atoi(tokens[i]); */
 336                                     break;
 337
 338                                 case CONF_MOD_MODE:
 339                                     if (i >= ntokens-1) {
 340                                             msyslog(LOG_ERR,
 341                                                     "mode: argument required");
 342                                             errflg = 1;
 343                                             break;
 344                                     }
 345                                     ++i;
 346                                     /* ttl = atoi(tokens[i]); */
 347                                     break;
 348
 349                                 case CONFIG_UNKNOWN:
 350                                     errflg = 1;
 351                                     break;
 352                             }
 353                         if (minpoll > maxpoll) {
 354                                 msyslog(LOG_ERR, "config error: minpoll > maxpoll");
 355                                 errflg = 1;
 356                         }
 357                         if (errflg == 0) {
 358                                 server = (struct server *)emalloc(sizeof(struct server));
 359                                 memset((char *)server, 0, sizeof(struct server));
 360                                 server->srcadr = peeraddr;
 361                                 server->version = peerversion;
 362                                 server->dispersion = PEER_MAXDISP;
 363                                 server->next_server = srvlist;
 364                                 srvlist = server;
 365                                 srvcnt++;
 366                         }
 367                         break;
 368
 369                         case CONFIG_KEYS:
 370                         if (ntokens >= 2) {
 371                                 key_file = (char *) emalloc(strlen(tokens[1]) + 1);
 372                                 strcpy(key_file, tokens[1]);
 373                         }
 374                         break;
 375                 }
 376         }
 377         (void) fclose(fp);
 378
 379         /* build final list */
 380         sys_numservers = srvcnt;
 381         sys_servers = (struct server **)
 382             emalloc(sys_numservers * sizeof(struct server *));
 383         for(i=0;i<sys_numservers;i++) {
 384                 sys_servers[i] = srvlist;
 385                 srvlist = srvlist->next_server;
 386         }
 387 }
 388
 389
 390
 391 /*
 392  * gettokens - read a line and return tokens
 393  */
 394 static int
 395 gettokens(
 396         FILE *fp,
 397         char *line,
 398         char **tokenlist,
 399         int *ntokens
 400         )
 401 {
 402         register char *cp;
 403         register int eol;
 404         register int ntok;
 405         register int quoted = 0;
 406
 407         /*
 408          * Find start of first token
 409          */
 410         again:
 411         while ((cp = fgets(line, MAXLINE, fp)) != NULL) {
 412                 cp = line;
 413                 while (ISSPACE(*cp))
 414                         cp++;
 415                 if (!ISEOL(*cp))
 416                         break;
 417         }
 418         if (cp == NULL) {
 419                 *ntokens = 0;
 420                 return CONFIG_UNKNOWN;  /* hack.  Is recognized as EOF */
 421         }
 422
 423         /*
 424          * Now separate out the tokens
 425          */
 426         eol = 0;
 427         ntok = 0;
 428         while (!eol) {
 429                 tokenlist[ntok++] = cp;
 430                 while (!ISEOL(*cp) && (!ISSPACE(*cp) || quoted))
 431                         quoted ^= (*cp++ == '"');
 432
 433                 if (ISEOL(*cp)) {
 434                         *cp = '\0';
 435                         eol = 1;
 436                 } else {                /* must be space */
 437                         *cp++ = '\0';
 438                         while (ISSPACE(*cp))
 439                                 cp++;
 440                         if (ISEOL(*cp))
 441                                 eol = 1;
 442                 }
 443                 if (ntok == MAXTOKENS)
 444                         eol = 1;
 445         }
 446
 447         /*
 448          * Return the match
 449          */
 450         *ntokens = ntok;
 451         ntok = matchkey(tokenlist[0], keywords);
 452         if (ntok == CONFIG_UNKNOWN)
 453                 goto again;
 454         return ntok;
 455 }
 456
 457
 458
 459 /*
 460  * matchkey - match a keyword to a list
 461  */
 462 static int
 463 matchkey(
 464         register char *word,
 465         register struct keyword *keys
 466         )
 467 {
 468         for (;;) {
 469                 if (keys->keytype == CONFIG_UNKNOWN) {
 470                         return CONFIG_UNKNOWN;
 471                 }
 472                 if (STRSAME(word, keys->text))
 473                         return keys->keytype;
 474                 keys++;
 475         }
 476 }
 477
 478
 479 /*
 480  * getnetnum - return a net number (this is crude, but careful)
 481  */
 482 static int
 483 getnetnum(
 484         const char *num,
 485         struct sockaddr_in *addr,
 486         int complain
 487         )
 488 {
 489         register const char *cp;
 490         register char *bp;
 491         register int i;
 492         register int temp;
 493         char buf[80];           /* will core dump on really stupid stuff */
 494         u_int32 netnum;
 495
 496         /* XXX ELIMINATE replace with decodenetnum */
 497         cp = num;
 498         netnum = 0;
 499         for (i = 0; i < 4; i++) {
 500                 bp = buf;
 501                 while (isdigit((int)*cp))
 502                         *bp++ = *cp++;
 503                 if (bp == buf)
 504                         break;
 505
 506                 if (i < 3) {
 507                         if (*cp++ != '.')
 508                                 break;
 509                 } else if (*cp != '\0')
 510                         break;
 511
 512                 *bp = '\0';
 513                 temp = atoi(buf);
 514                 if (temp > 255)
 515                         break;
 516                 netnum <<= 8;
 517                 netnum += temp;
 518 #ifdef DEBUG
 519                 if (debug > 3)
 520                         printf("getnetnum %s step %d buf %s temp %d netnum %lu\n",
 521                            num, i, buf, temp, (u_long)netnum);
 522 #endif
 523         }
 524
 525         if (i < 4) {
 526                 if (complain)
 527                         msyslog(LOG_ERR,
 528                                 "getnetnum: \"%s\" invalid host number, line ignored",
 529                                 num);
 530 #ifdef DEBUG
 531                 if (debug > 3)
 532                         printf(
 533                                 "getnetnum: \"%s\" invalid host number, line ignored\n",
 534                                 num);
 535 #endif
 536                 return 0;
 537         }
 538
 539         /*
 540          * make up socket address.      Clear it out for neatness.
 541          */
 542         memset((void *)addr, 0, sizeof(struct sockaddr_in));
 543         addr->sin_family = AF_INET;
 544         addr->sin_port = htons(NTP_PORT);
 545         addr->sin_addr.s_addr = htonl(netnum);
 546 #ifdef DEBUG
 547         if (debug > 1)
 548                 printf("getnetnum given %s, got %s (%lx)\n",
 549                    num, ntoa(addr), (u_long)netnum);
 550 #endif
 551         return 1;
 552 }